This is the English translation of the Yoga-kundalini Upanishad (belonging to the Krishna-Yajurveda): a minor Sanskrit treatise selected amongst a collection 108 extant upanishads, dating to at least the 1st millennium BC.The Yoga-kundalini-upanishad expounds the theory of Kundalini Yoga and describes the systems of Hatha and Lambika yoga. Kundalini refers to the coiled-up energy that can be aroused by advanced yogic practicioners.